I need to find a binding for barium titanate powder. I think to use
a silicon glue as binding but I don’t know in what proportion .
I am interested too to not very difficult alternatives i.e. to use
other binding , different from silicon , to make compact bariun
titanate powder.
Besides I have found for liquid silicon glue a relative dielectric
constant of about 11 . When silicon became rigid it decrease?

Thanks




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just what are you trying to do?? there are all sorts of binding agents you
could use depending on the requirements, just about any glue could be used,
but they have different mechanical and chemical properties. probably the
most durable would be an epoxy, but there are also castable plastic resins
like the ones used for hobbyist to make paperweights, all the way down to
simple casein based glues.


"Sutor78" wrote in message
.. .
I need to find a binding for barium titanate powder. I think to use
a silicon glue as binding but I don't know in what proportion .
I am interested too to not very difficult alternatives i.e. to use
other binding , different from silicon , to make compact bariun
titanate powder.
Besides I have found for liquid silicon glue a relative dielectric
constant of about 11 . When silicon became rigid it decrease?

Thanks




-----
This article posted from the web-interface to the Internet Partners news
server (news.ipinc.net), Portland's full-service business Internet
provider. Check out http://news.ipinc.net/ for free web access to Usenet
news.

Dave wrote:
just what are you trying to do?? there are all sorts of binding agents you
could use depending on the requirements, just about any glue could be used,
but they have different mechanical and chemical properties. probably the
most durable would be an epoxy, but there are also castable plastic resins
like the ones used for hobbyist to make paperweights, all the way down to
simple casein based glues.

Is there a superstrong glue that remains flexible after
hardening? Something with a little give to it?
--
73, Cecil http://www.w5dxp.com

Dave wrote:
depends on what you are trying to glue. plain old rubber cement when used
properly has those properties.

You just reminded me of the stuff I once used on
my wet suit in CA - thanks.
--
73, Cecil http://www.w5dxp.com

"Cecil Moore" wrote in message
. ..
Dave wrote:
just what are you trying to do?? there are all sorts of binding agents
you could use depending on the requirements, just about any glue could be
used, but they have different mechanical and chemical properties.
probably the most durable would be an epoxy, but there are also castable
plastic resins like the ones used for hobbyist to make paperweights, all
the way down to simple casein based glues.

Is there a superstrong glue that remains flexible after
hardening? Something with a little give to it?

depends on what you are trying to glue. plain old rubber cement when used
properly has those properties.

On Mon, 25 Dec 2006 20:49:47 -0000, "Dave" wrote:


"Cecil Moore" wrote in message
...
Dave wrote:
just what are you trying to do?? there are all sorts of binding agents
you could use depending on the requirements, just about any glue could be
used, but they have different mechanical and chemical properties.
probably the most durable would be an epoxy, but there are also castable
plastic resins like the ones used for hobbyist to make paperweights, all
the way down to simple casein based glues.

Is there a superstrong glue that remains flexible after
hardening? Something with a little give to it?

depends on what you are trying to glue. plain old rubber cement when used
properly has those properties.

So does good lold Silastic RTV (TM)


Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com

Cecil Moore wrote:
Dave wrote:
depends on what you are trying to glue. plain old rubber cement when
used properly has those properties.

You just reminded me of the stuff I once used on
my wet suit in CA - thanks.

How about the clear silicone stuff they use to cement aquariums with?
Should be able to pick up a tube of it in any large pet supply ...

Regards,
JS

I'm not sure some of the suggested compounds would work.

I assume the OP is interested in maintaining a very high dielectric
constant -- at least, that's a common reason for using barium titanate.
The presence of even tiny gaps between particles will drastically lower
the overall dielectric constant, for the same basic reason (substituting
electric for magnetic fields) that an air gap in a magnetic path
consisting of otherwise high permeability material will drastically
lower the overall permeability. So what's required is a compound that
allows the barium titanate particles to contact each other. I don't know
what kind of binder might do this, but it seems to me it would have to
be something that shrinks as it dries or cures, like conductive epoxy
binder. Conductive epoxy binder pulls the gold or silver particles
together when it cures to get good electrical conductivity.

I thought that capacitors and the like which use barium titanate were
fired into a homogeneous ceramic.

Roy Lewallen, W7EL